I was treating one of my females in her own tank with aquarium salt and found the other day that not only was she not getting better, but the edges of her fins had turned black and she had white fizzy fungal growth on her sides. How she developed that while living in salt, I have no idea!

So, she's currently in a QT cup in water treated with conditioning solution, stress zyme, and aquarium salt (2 tsp per gallon). The cup is floating in a tank maintained at 78 degrees and she's getting 100% water changes every 24 hours.

She's still very active and not lethargic at all, but because she's a normally a really active girl, she HATES being in the cup. She'll sit on the bottom for a moment, then dart all around the cup like a crazy woman. I hate seeing her confined and unhappy, but I think the QT cup is the best for her so I can get her healthy. Any suggestions/ advice? :(

No bright red areas. She started with two white cotton-y balls on her, one on her scales and one on her fins. Then she got the thin white fizzy-looking layer over her scales. There's no other organic matter in her tank. Her plants are plastic and there's nothing growing on them.

Nothing new has been done to her home tank. My girls have all been separate while their sorority tank is cycling.

Behaviourally, she doesn't show symptoms of being unwell. She's very active and responsive to me. She's still easting well. She tips to the side a little when she lays on the bottom of her cup, but that's it.